#!/usr/bin/env python
#-*- coding:utf-8 -*-

class NodeSearcher(object): #抽象
    def __init__(self):
        pass

    def search(self):
        pass

class BFSNodeSearcher(NodeSearcher):
    pass

class DFSNodeSearcher(NodeSearcher):
    pass

def test():
    pass 

if __name__ == "__main__":
    test()